nicotinen.尼古丁nicotine concentration烟碱nicotine hemochromogen烟碱血色原nicotine hydrochloride烟碱盐酸盐nicotine N-demethylase尼古丁去甲基化酶nicotine conversion rate烟碱转化率nicotine-reducing agent开片降碱灵nicotine stimulation test烟碱兴奋试验nicotine--replacement尼古丁替代疗法nicotine-stained fingers被尼古丁燻黄的手指Nicotine-related disorder尼古丁有关的障碍